Michael, Pippa

Scott, J.

Yeoh, P.

English

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363Eighteenth Australasian Weeds ConferenceSummary Chloris truncata is a short-lived summer-active stoloniferous grass that is widely established throughout temperate regions of Australia except Tasmania. Although considered a valuable rehabili-tation and potential pasture species in Australia, it is otherwise regarded as a significant weed of agricultural systems due a range of factors including allopathic effects and hosting of pests and diseases. Chloris truncata has been widely dispersed since the 18th century within Australia where it has been a wool contaminant. Since that time, the waste from wool scouring plants located across the northern hemisphere has led to numerous introductions of C. truncata, but not all have survived. Its proposed use as a pasture species meant further introductions including by the prolific seed disperser Ferdinand von Mueller in the 1880s, through to more recent introductions in the 1970s to experimental field stations in USA—there was mixed success in its establishment. This provides an opportunity to examine the prediction of a species distribution (not only to regions predicted to be suit-able, but also to where it is known to be unsuitable). We developed a distribution model for C. truncata using CLIMEX, a program that models the potential response of a species to climate based on geographi-cal distribution, biology and seasonal phenology. The growth response of C. truncata to constant tempera-tures was measured and used along with values for moisture inferred from the Australian distribution to Potential distribution of Chloris truncata (windmill grass) in relation to climate and soils Pippa J. Michael1,  Paul B. Yeoh2 and  John K. Scott21 Curtin University, Private Bag 1, P.O. Northam WA 6401 2 Climate Adaptation Flagship, CSIRO Ecosystem Sciences, Private Bag 5, P.O. Wembley WA 6913(p.michael@curtin.edu.au)develop parameters for a CLIMEX model of potential distribution. We used the native distribution of eastern Australia and introduced areas of Western Australia to verify the model and to show associations with soil types. The projection of the model to the world was tested for presence and absence using the observed established and failed distributions. The verified model was then projected to future conditions due to climate change showing a reduced distribution in Australia, but an expansion overseas. Full details of the development of the model and results can be found in Michael et al. (2012).Keywords  CLIMEX,  distribution model,  climate.ACKNOWLEDGMENTSThis work was supported by Curtin University, CSIRO Climate Adaptation Flagship and grants from the Department of Agriculture, Fisheries and Forestry (AWRC08-85) and Rural Industries Research and Development Corporation (PRJ006828).R EFERENCESM ichael, P.J., Yeoh, P.B. and Scott, J.K. (2012). Po-tential distribution of the Australian native Chloris truncata based on modelling both the successful and failed global introductions. PLoS ONE (ac-cepted subject to revision). 

Potential distribution of Chloris truncata (windmill grass) in relation to climate and soils

https://espace.curtin.edu.au/bitstream/20.500.11937/30260/2/191167_70708_Michael_et_al_2012_Chloris_18AWC.pdf

Potential distribution of Chloris truncata (windmill grass) in relation to climate and soils

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